Hi,

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Although the diesel is not mainstream in the US, in Europe over half of the new cars sold are diesels, probably because of the improvements made to the diesel engine over the past 20 years, and the much high price of petrol in Europe.
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Diesel was much cheaper but now, in the UK, it is actually more expensive per litre than petrol - although the lower fuel consumption still makes it a cheaper alternative.

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Biodiesel is made from corn or other plants, and is completely safe to the environment, so it holds much promise for the US in cleaning up the environment, and weaning the US off of its dependence on foreign oil.
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Some diesel owners here run their vehicles on cooking oil which, because it is untaxed, works out cheaper than diesel. Not legal of course...

Regards,
Viv